Mechanical

It could be anything from bad spark plugs to engine mechanical problem.

Most common causes for such problems would be sprak plugs, its wires, distributor cap and/or rotor.

If the engine is difficult to start after stalling and would restart easily after waiting a while, it could be due to a faulty PGM-FI main relay. Remove the relay and resolder the circuit board and retest.

If it stalls only when slowing down and can be kept running with pressure on the gas pedal, it is a fault with the idling circuit, which doulc be due to a dirty throttle body and Idle Air Control valve. Cleaning the throttle body and IAC should resolve the problem. You might have to readjust the idling speed after clening the components.

Cleaning the throttle body is not difficult. Whoever told you that must have never done the job before.

A proper cleaning would require the throttle body to be removed but if you remove the air cleaner hose, using carb cleaner to spray nto the throttle body and scrubbing the internal part of the barrel with throttle fuully opened should do the trick. The IAC would have to be removed but you need not take everything out. Just remove the holding bolts, together with the fast idle (cold start valve) and spraying carb cleaner into it should allow you to clean it reasonably.

The symptoms you are describing does not seem to be a fault with the idling system, more likely to be the thrpottle position sensor, located oat side of throttle body.

Is the Check Engine Light indicating?

Is the Check Engine Light indiating?

Have the TPS tested to see if it is faulty.